# Corey

Popular questions and responses by Corey-
## chemistry

How many moles of solid Ba(NO3)2 should be added to 300 ml of .2 M Fe(NO3)3 to increase the concentration of NO3- ion to 1 M?

*asked on October 3, 2007* -
## physics

A 65.0-kg runner has a speed of 5.20 m/s at one instant during a long-distance event. (a) what is the runner's kinetic energy at this instant? (b) if he doubles his speed to reach the finish line, by what factor does his kinetic energy change

*asked on March 1, 2012* -
## math

First grade math Tell the Rule? Group 1 3 flowers w/4 petals each Group 2 3 flowers w/five petals each in triangle?

*asked on January 17, 2008* -
## chemistry

how many protons and nuetrons are contained in the nucleus of each of the following atoms? assuming each atom is uncharged, how many electrons are present? a. 235/92U b. 13/6C c. 57/26Fe d. 208/82Pb e. 86/37Rb f. 41/20Ca

*asked on September 20, 2009* -
## math

Elmer has a collection of 300 fossils. Of these, 21%, percent are fossilized snail shells.

*asked on June 21, 2017* -
## chemistry

What is the finaly concentration of barium ions, Ba2+, in soulution with 100 ml of .1 M BaCl2 is mixed with 100ml of .05M H2SO4?

*asked on October 3, 2007* -
## chemistry

A 1.0 L sample of an aqueous solution contains .1 mol of NaCl and .1 mole of CaCl2. What is the minimum number of moles of AgNO3 that must be added to the solution in order to precipitate all of the Cl(1- charge) as AgCl?(assume that AgCl is insoluble.)

*asked on October 3, 2007* -
## Math help

55h + 275 = 440 Do I subtract 55 from 275 ?

*asked on May 16, 2013* -
## College English

I submitted this yesterday and Ms. Sue thought I did well (except 7,11) but I still managed to get 4 wrong - and my mind is a mess trying to figure out where I went wrong! Please help - my mid is coming! >> represents my chosen answer. 1. Having studied

*asked on September 7, 2010* -
## math

how can addition properties help me add whole numbers?

*asked on October 2, 2013* -
## AP chem

This is part of a marathon problem, we have to identify the five compunds of H, N, and O described below. For each compound, I have to write a Lewis structure that is consistent with the information given. a.) All the compunds are electrolytes, although

*asked on November 7, 2007* -
## science

calculate the mass in kg of an object that weighs 1225 n on earth

*asked on May 19, 2008* -
## AP Physics

A person jumps from the roof of a house 3.0 m high. When he strikes the ground below, he bends his knees so that his torso decelerates over an approximate distance of 0.60 m. The mass of his torso (excluding legs) is 48 kg. *How do I find the average force

*asked on November 13, 2008* -
## Calculus

Breathing is cyclic and a full respiratory cycle from the beginning of inhalation to the end of exhalation takes about 5 seconds. The maximum rate of air flow into the lungs is about 0.5 L/s. This explains, in part, why the function f(t)=1/2sin(2pi t/5)

*asked on September 11, 2017* -
## Phyics

An object in simple harmonic motion has an amplitude of 0.202 m and an oscillation period of 0.620 s. Determine the maximum speed of the motion.

*asked on November 16, 2013* -
## math

identify the two numbers less than 20 with the most factors

*asked on November 7, 2012* -
## math

A car license plate consists of 6 characters. The first 3 characters are letters excluding I, O, Q and U. The last 3 characters are any of the numerals 0 to 9 inclusive. How many different license plates are possible? Please show your work.

*asked on May 23, 2011* -
## Physics

fully loaded, slow-moving freight elevator has a cab with a total mass of 1250 kg, which is required to travel upward 58 m in 3.4 min, starting and ending at rest. The elevator's counterweight has a mass of only 1005 kg, and so the elevator motor must

*asked on November 4, 2009* -
## physics

A grinding wheel 0.40 m in diameter rotates at 2200 rpm. What is the acceleration of a point on the edge of the grinding wheel?

*asked on October 31, 2010* -
## College English

I have been pouring over this all day and would appreciate if someone could look this over for me with some good news... am I getting it? Gracias! >> represents my chosen answer. 1. Having studied small engine repair in night school, fixing the lawn mower

*asked on September 6, 2010* -
## Reading math

on January they sold 139 more Doughlas firs than Noble firs. The toal trees sold was 377. which of these is right for me to solve it?? n-139=377 n+139 = 377 2n +139 =377 2n+139 = 377 I think it is the first one??

*asked on May 16, 2013* -
## Finance

Ten years ago, Levin Inc. earned $0.50 per share. Its earnings this year were $2.20. What was the growth rate in Levin's earnings per share (EPS) over the 10-year period?

*asked on March 2, 2011* -
## Physic

A 2.0 kg box moves back and forth on a horizontal frictionless surface between two different springs with one 32 N/cm and the other at 16 N/cm.The box is initially pressed against the stronger spring, compressing it 3.5 cm , and then is released from rest.

*asked on November 24, 2017* -
## geometry

The volume of a cylinder is 980 in.4072-07-02-02-00_files/i0220001.jpg. The height of the cylinder is 20 in. What is the radius of the cylinder? Express your answer to the nearest hundredth.

*asked on July 13, 2014* -
## Physics

A 44 m diameter wheel accelerates uniformly about its center from 110 rpm to 320 rpm in 3.9 s. Determine the radial component of the linear acceleration of a point on the edge of the wheel 1.0 s after it has started accelerating.

*asked on October 31, 2010* -
## physics

A 44 m diameter wheel accelerates uniformly about its center from 110 rpm to 320 rpm in 3.9 s. Determine the radial component of the linear acceleration of a point on the edge of the wheel 1.0 s after it has started accelerating.

*asked on October 31, 2010* -
## Physics

A 10.0 g object moving to the right at 19.0 cm/s makes an elastic head-on collision with a 15.0 g object moving in the opposite direction at 30.0 cm/s. Find the velocity of each object after the collision.

*asked on November 7, 2012* -
## physics 2

1) A spherical surface completely surrounds a collection of charges. Find the electric flux through the surface if the collection consists of a single +3.93E-6 C charge. 2) A plate carries a charge of -2.52μC, while a rod carries a charge of +2.19μC. How

*asked on January 30, 2010* -
## Math help

I am so lost I have a problem. Two congruet figures. First trapezoid: 1 side b is 10 1 short base prarallel 6 Angle D 86 degrees Angle C 41 degrees Angle B ? Angle A ? Other angle J is 133 degrees Angle M ? Angle K ? Side d leg 17 Angle L ? long Base

*asked on April 16, 2013* -
## physics

A hydraulic jack in a gas station lifts a 900kg car a distance of .25cm When a force of 150N pushes a piston through a distance of 20cm Find the IMA (book answer is 80) AMA (book answer is 59) Efficency (book answer is 74%) can you help, I have no idea how

*asked on February 21, 2010* -
## Geometry

Where can the lines containing the altitudes of an obtuse triangle intersect? I. inside the triangle II. on the triangle III. outside the triangle A)I only B)I or II only C)III only D)I, II, or III PLEASE HELP ME ASAP!!!!

*asked on December 6, 2012* -
## skyline

a scale model of a car is 8 inches long. the actual car is 12 feet long. what is the scale of the model?

*asked on January 23, 2013* -
## American Lit

Compare and Contrast the characters Natty Bumppo in The Prairie and John in Hospital Sketches.

*asked on May 9, 2010* -
## Physics

A car weighing 1.1*10^4 N is parked on a 35 degree slope. Find the force tending to cause the car to roll down the hill. What is the force the car exerts perpendicular to the hill?

*asked on December 7, 2009* -
## ap Calculus

A right circular cone has a fixed slant height, s= 12 inches. Determine the radius and the height of the cone with maximum volume

*asked on November 5, 2008* -
## physics

A bookshelf is at rest in a room. A force of 35.0 newtons is applied to a bookshelf. If the floor imparts a frictional force of 2.90 newtons, what is the net force acting on the bookshelf?

*asked on March 24, 2014* -
## Physics

a 3.7 kg dog stands on a 19 kg flatboat at distance D = 6.1 m from the shore. It walks 2.6 m along the boat toward shore and then stops. Assuming no friction between the boat and the water, find how far the dog is then from the shore. _ _ _ _ _ _ m

*asked on November 18, 2009* -
## physics

A student, crazed by the first physics Midterm, uses a pushing force of 80 N angled at 70° to push a 5.0 kg book across the frictionless ceiling of his room. a. What is the block's acceleration? b. What is the force of the ceiling on the book?

*asked on April 8, 2013* -
## Physics

Among the safety features on elevator cages are spring-loaded brake pads which grip the guide rail if the elevator cable should break. Suppose that an elevator cage of 2000 kg has two such pads, arranged to press against opposite sides of the guide rail,

*asked on November 3, 2019* -
## programming logic and design

I need help writing pseudocode for this problem: Design a retirement planning calculator for skulling financial services • Allow a user enter a number of working years remaining in the user career and the annual amount of money the user can save •

*asked on July 21, 2014* -
## math

round to nearest hundred. 113, 279, 367

*asked on September 16, 2013* -
## ap chemistry

Find the grams of NaF added to 300ml of .2M HF to create a buffer with pH=3.5.

*asked on November 15, 2007* -
## physics

A 44 m diameter wheel accelerates uniformly about its center from 110 rpm to 320 rpm in 3.9 s. Determine the radial component of the linear acceleration of a point on the edge of the wheel 1.0 s after it has started accelerating. Determine the tangential

*asked on October 31, 2010* -
## Physics

A 23 kg suitcase is being pulled by a handle that is at an angle of 22 degrees above the horizontal. If the normal force exerted on the suitcase is 185 N, what is the force applied to the handle? *** Objects NOT on an incline they are being pushed/pulled

*asked on December 7, 2009* -
## college physics

the speed of light is about 3.00 x 10^8 m/s. convert this figure to miles per hour

*asked on September 7, 2008* -
## physics

Compute your average velocity in the following two cases: (a) You walk 73.6 m at a speed of 1.79 m/s and then run 73.6 m at a speed of 4.31 m/s along a straight track. (b) You walk for 1.00 min at a speed of 1.79 m/s and then run for 1.30 min at 4.31 m/s

*asked on September 9, 2012* -
## geometry

in segment pt, l is the midpoint of pa and a is the midpoint of pn. if pn = 17 and la = 3.5, what is the length of nt?

*asked on April 29, 2012* -
## physics

A 4.8 kg block is pushed along the ceiling with a constant applied force of 87 N that acts at an angle of 55.0° with the horizontal, as in Figure 4-33. The block accelerates to the right at 6.00 m/s2. Determine the coefficient of kinetic friction between

*asked on December 5, 2010* -
## AP Chemistry

Find the grams of NaF added to 300ml of .2M HF to create a buffer with pH=3.5.

*asked on November 15, 2007* -
## Math Geometery

Is it possible to have more than one vertical line of symmetry? Why???

*asked on April 11, 2013* -
## physics

The roof on a house rises 1.50 m over a horizontal diestance of 3.50 m. A 72.9-kg roofer stands on the roof. Is the frictional force that keeps the roofer from slipping equal in magnitude to F perpendicular or F paralell? What is its magnitude?

*asked on December 7, 2009* -
## math

which number is this rounded too, the nearest ten or hundred? 557 rounds 560

*asked on September 16, 2013* -
## math

A multiple-choice test has 10 questions. Each question has 5 choices. If a student answers each question by guessing randomly, find the probability that the student gets: a) at most 4 questions correct b) at least 7 questions correct Please show your work.

*asked on May 23, 2011* -
## math

There are 6 boys and 8 girls in a group of students. Calculate the number of ways that a president, vice-president and treasurer can be selected. Please show your work.

*asked on May 23, 2011* -
## physics

A 38.2 kg wagon is towed up a hill inclined at 19° with respect to the horizontal. The tow rope is parallel to the incline and exerts a force of 140 N on the wagon. Assume that the wagon starts from rest at the bottom of the hill, and disregard

*asked on December 5, 2010* -
## physics

A 38.2 kg wagon is towed up a hill inclined at 19° with respect to the horizontal. The tow rope is parallel to the incline and exerts a force of 140 N on the wagon. Assume that the wagon starts from rest at the bottom of the hill, and disregard

*asked on December 5, 2010* -
## math

A committee of 4 is chosen from a group of 10 women and 6 men. Determine the probability that at least 2 women are on the committee. Please show your work.

*asked on May 23, 2011* -
## calculus

A golf ball of mass 0.05 kg is struck by a golf club of mass m kg with a speed of 50m/s will have an initial speed of v(m)=83m/(m+0.05) m/s. show that v'(m)>0 and interpret this result in context with the application. Compare v'(0.15) and v'(0.20) in

*asked on September 27, 2012* -
## Math

A recipe calls for 3/4 cup of flour to make 18 cookies. How much flour is required per cookie?

*asked on February 1, 2020* -
## Public High School AP Physics B

Ok I got a question I'm confused by the compression ratio bit in this problem and don't know how to do it If 3.00 m^3 of a gas initally at STP is placed under a pressure of 3.20 atm, the temperature of the gas rises to 38.0 degrees C. What is the volume? I

*asked on November 16, 2009* -
## algebra2

The number of years that a stock of $40 increases to $50 at a rate of 8% per year can be written by the logarithmic expression: log1.08(50 over 40) a. use your calculator to determine how many years it will take for the stock to reach $50.

*asked on June 1, 2015* -
## Math

The volume of a pyramid varies jointly with the base area of the pyramid and its height. The volume of one pyramid is 24 cubic inches when its base area is 24 square inches and its height is 3 inches. What is the volume of a pyramid with a base area of 10

*asked on September 3, 2017* -
## Phyics

A 17-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 28 N. Starting from rest, the sled attains a speed of 2.3 m/s in 10 m. Find the coefficient of kinetic friction between the runners of the sled and the snow.

*asked on September 26, 2013* -
## math

A car license plate consists of 6 characters. The first 2 characters are any letter. The last 4 characters are odd numbers from 1 to 9 inclusive. How many different license plates are possible? Please show your work.

*asked on May 23, 2011* -
## Science

Is this chemical equation correct and properly balanced, C3H4 + 5O2--> 3CO2 + 44H2O ?

*asked on January 13, 2011* -
## physics

You are loading a refrigerator weighing 2250 N onto a truck, using a wheeled cart. The refrigerator is raised 1.00 m to the truck bed when it is rolled up a ramp. Calculate the minimum work that must be done by the force you apply and the magnitude of the

*asked on November 4, 2014* -
## Math

Annie has quarters and dimes in her bank. There are 8 less than 4 times as many dimes as quarters. There is $6.35 in her bank. How many dimes are in her bank?

*asked on August 28, 2008* -
## math

A company has two factories that manufacture tires. Suppose 65% of the tires are manufactured in factory 1 and 35% are manufactured in factory 2. In factory 1, 5% of the tires are defective. In factory 2, 2% of the tires are defective. a) Determine the

*asked on May 23, 2011* -
## English

In the sentence Manuel is the new goalie on the team. What is the compound noun

*asked on October 30, 2008* -
## math

Solve the following equations algebraically for n. Show your working using factorial notation. a) n!/3!(n-2)! = 12 b) 8Pn = 6720

*asked on May 23, 2011* -
## math

Part 2: Now it’s time to make the guest list! Figure out how many guests you will have at your party, and how much it will cost to feed everybody. You have four grandparents coming. For the adults, you have your parents, your best friend’s parents,

*asked on April 23, 2010* -
## math

There are 48 small gift bags. Each bag can hold 1 toy and 6 stickers. If an equal number of stickers are put in each bag, how many stickers will be in each bag?

*asked on November 6, 2007* -
## Calculus

Find the volume of the solid formed by rotating the region inside the first quadrant enclosed by y = x^3 y = 16 x about the x-axis.

*asked on September 11, 2017* -
## Physics

Two blocks of masses m1 = 2.00 kg and m2 = 4.50 kg are each released from rest at a height of y = 5.80 m on a frictionless track, as shown in the figure below, and undergo an elastic head-on collision. (a) Determine the velocity of each block just before

*asked on November 7, 2012* -
## Physics

A coin slides over a frictionless plane and across an xy coordinate system from the origin to a point with xy coordinates (3.0 m, 4.1 m) while a constant force acts on it. The force has magnitude 2.4 N and is directed at a counterclockwise angle of 100°

*asked on October 30, 2009* -
## AP Physics

A 239-kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 29.0° with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.800, and the log has an

*asked on November 13, 2008* -
## chemistry

What is the hydroxide concentration if the hydronium is .03 M?

*asked on October 22, 2007* -
## chemistry

5Fe(2+ charge) + MnO4(-1 charge) +8H(1+ charge) -> 5Fe(3+ charge) + Mn(2+ charge) + 4H2O In a titration experiment based on the equation above, 25ml of an Acidified Fe(2+ charge) solution requires 14 ml of standard .050 M MnO4(1- charge) solution to reach

*asked on October 3, 2007* -
## Algebra 104

1. A square piece of cardboard measuring 60 inches on a side is made into a rectangular box by cutting identical squares from the four corners and then folding up the flaps. Let represent the length of the side of the discarded square. Write a formula for

*asked on May 13, 2015* -
## algebra

In Canada, $1 and $2 bills have been replaced by coins. When Marissa returned home from to San Francisco from a trip to Vancouver, she found that she had acquired 37 of these coins with a total value of $51 Canadian. How many each denomination did she

*asked on February 5, 2015* -
## math

Part 2: Now it’s time to make the guest list! Figure out how many guests you will have at your party, and how much it will cost to feed everybody. You have four grandparents coming. For the adults, you have your parents, your best friend’s parents,

*asked on April 22, 2010* -
## chemistry

if you have Ca(NO3)2 times xH2O do u count the Hydrate when looking for the mass % of Ca

*asked on October 17, 2007* -
## Math

If I spend one third of my money on ice cream an half on a book what fraction of my money would I have left

*asked on January 31, 2018* -
## math

if a driver is at an acute angle and wants to be completely straight as she enters the pool. what will be the measure of the angle her body will form then?

*asked on February 9, 2015* -
## Phyics

A sprinter explodes out of the starting block with an acceleration of + 2.43 m/s2, which she sustains for 1.10 s. Then, her acceleration drops to zero for the rest of the race. What is her velocity at (a)t = 1.10 s and (b) at the end of the race?

*asked on September 24, 2013* -
## math help plesase????

A person who weighs 130 pounds can burn about 300 calories per hour skateboarding. Write a function that relates the calories burned, c, to the number of hours, h, spent skateboarding. Identify the independent and dependent variable. Create a function

*asked on May 16, 2013* -
## chemistry

Determine a compound that will precipitate the (Hg2)^2+ in Hg2X2(soluble).

*asked on October 15, 2007* -
## math

What is the 8th term of (3x-1/2y)^10

*asked on May 23, 2011* -
## Physics

To move a crate across a rough floor, you pull on it at an angle of 21 degrees above the horizontal. How much force is needed if the mass of the crate is 32kg and the coefficient of static friction between the crate and floor is 0.57

*asked on March 6, 2012* -
## science

C3H8+5O2--->3CO2+4H2O is this chemical equation correct and equal? If not why?

*asked on January 13, 2011* -
## physics

A box of books weighing 229 N is shoved across the floor by a force of 420 N exerted downward at an angle of 35° below the horizontal.If µk between the box and the floor is 0.57, how long does it take to move the box 9 m, starting from rest? (If the box

*asked on December 5, 2010* -
## Math help Geometery

If, I ahve a trapezoid with two angles Angle 86 degrees and 41 degrees and angle A 133 degrees then,side b 10 Short base 6 How do I solve to get angle B?

*asked on April 16, 2013* -
## physics

A box of books weighing 229 N is shoved across the floor by a force of 420 N exerted downward at an angle of 35° below the horizontal.If µk between the box and the floor is 0.75, how long does it take to move the box 7 m, starting from rest? (If the box

*asked on December 5, 2010* -
## AP chem

This is part of a marathon problem, we have to identify the five compunds of H, N, and O described below. For each compound, I have to write a Lewis structure that is consistent with the information given. a.) All the compunds are electrolytes, although

*asked on November 7, 2007* -
## chemistry

It requires 30ml of .5M H3PO4 to titrate 45ml of Ca(OH)2 to the equivalence point. What is the M of the base?

*asked on October 3, 2007* -
## Science

What is the morality of a solution made by dissolving 9.80 g of H2SO4 in a 200.0 g of H2O?

*asked on April 2, 2017* -
## math

There are 6 boys and 8 girls in a group of students. Calculate the number of ways that a committee of 3 students which has at least 1 girl can be selected from the group. Please show your work.

*asked on May 23, 2011* -
## math

The freshman class is building a float for homecoming.One side of the float has a shape of a parallelogram with base of 12' and height of 6'. To complete the float the class must buy tissue to cover the side. It takes 3 boxes of tissue to cover each foot.

*asked on April 4, 2011* -
## Music

How do you download music from jiskha?

*asked on March 2, 2010* -
## Algebra

What if the last term has a square root that is a big, long decimal? you wouldn't use the decimal, would you?

*asked on April 22, 2008*

## Pages

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